Magnesium alloy



names A... 5, 1941 2,251,266

MAGNESIUM ALLOY Arthur' Burkhardt, Berlin-Lichterielde, Richard Knabe, Berlin-Zehlendori, and Karl Rlederer, Munich, Germany, assignors to Georg -.Von

Giesches Erben, Breslau, Germany, a corporation of Germany No Drawing. Application November 9, 1939, Se-

rial 1938 No. 303,610. In Germany December 16,

4 Claims. (Ci. 75- 168) Our invention relates to a magnesium alloy, and more especially to an alloy of the type described in U. S. Patent 2,159,964, for "Magnesium alloy, patented May-30, 1939.

In this patent, a magnesium alloy has been described that contains 2 to 6% bismuth, 0.5 to 3% cadmium, 1 to 5% aluminium, and 1 to 3.5% zinc. The remainder is substantially all magnesium. The phrase substantially all magnesium" is intended to include magnesium and magnesium with minor amounts of customary impuritiesand auxiliaries. Such auxiliary alloying elements are, for instance, 0.1 to 2% each of manganese, calcium, silicon, or one of the metals of the iron group (iron,nickel, and cobalt) separately or collectively. Such and other auxiliaries are usual in mangesiuin alloys and they do not influence the characteristic properties of our. novel alloys.

Preferably, the alloy described in the said patent contains 4 to 5% bismuth, about 2% cadmium, 2 to 4% aluminium, and about 3% zinc,

' -the remainder being substantially all magnesium,

as defined above.

The said alloy possesses satisfactory resistance to corrosion and, first and foremost, high mechanical properties.

It is an object of our invention to improve an alloy of the type aforesaid, especially with a view to increasing its ductility.

To this end,'we add to the said alloy 0.2 to 4% titanium. v

The magnesium alloy. according to ourinvention is consequently characterised by a content of .2 to 6% bismuth, 0.5'to 3% cadmium, 1 to 5% aluminium, 1 to 3.5% zinc, about 0.2 to 4% titanium, remainder substantially all magnesium. 1

Preferably, the alloy according to our invention contains 4 to 5% -bismuth, about 2% cad-' mium, 2 to 4% aluminium, about 3% zinc, about 0.2 to 4% titanium, remainder substantially all magnesium.

The titanium-containing magnesium alloys according to the invention compare favorably with the alloys according to the said U.'S. patent inthat their ductility is improved, as demonstrated by higher values of elongation and reduction of nesium alloys of high tensile strength and particularly high ductility.

By way of example, an alloy according to the invention may have the followingcomposition: 2 to 6% bismuth, 0.5 to 3% cadmium, 1 to 5% aluminium, 1 to 7% titanium, remainder substantiallyall magnesium.

By increasing the content of zinc up to 7%, as described, we provide alloys whose tensile strength is 34 to 36 kg. per sq. mm. and whose elongation is about 22 to 24%. Due to the content of about 0.2 to 4% titanium, the ultimate strength of the alloys is still further increased.

In the following tabulation, some more examples of alloys according to our invention are given, it being understood that for all alloys in I the tabulation the remainder is substantially all Examples Content of constituents, per cent Al in ca Zn We claim:

1. A magnesium alloy containing .2 to 6% bismuth, 0.5 to. 3% cadmium, l to 5% aluminium, 1 to 3.5% zinc, about 0.2 to 4% titanium, the remainder substantially all magnesium.

2. A magnesium alloy containing 4 to 5% bismuth, about 2% cadmium, 2 to 4%. aluminium,

"about 3% zinc, about 0.2'to 4% titanium, the

remainder substantially all magnesium.

3. A magnesium alloy containing 2 to 6% bismuth, 0.5 to 3% cadmium, 1 to 5% aluminium, l to 7% zinc, about 0.2 to 4% titanium, the remainder substantially all magnesium.

4. A magnesium alloy containing 2 to 6% bismuth, 0.5 to 3% cadmium, 1 to 5% aluminium, more than"3.5 to 7% zinc, about 0.2 to 4% titanium, the remainder substantially all magnesium.

zinc, about 0.2 to 4% 

